From the author:
Patched this together on request, M18x R1 BIOS A05 (unlocked) with the RST 11.5 OROM.
The orom comes from the station-drivers site, not sure whether it will work fine with the M18x, though I don't really see why it shouldn't.
Btw, something's weird with the original orom in the R1 BIOS, the checksum is wrong... confusing.
Anyway, here's the BIOS, let me know how it performs. Also remember to use the latest RST driver for this ROM.
Flash with your favorite BIOS utility or the tools provided by Dell.
As always, use at your own risk..
Original thread:

Hello, I saw your post where you left Vbios downloads with different settings etc. I'll cut straight to it, I would like to pay for a Vbios that works with my M17x R2 laptop. I have tried flashing every VBios including the ones you listed, and the closest it gets is working on an external display. It plays just fine but I cant get it on my laptop screen, external only.

User with any of the M14x R2 / M17x R4 / M18x R2 notebooks with a current BIOS have reported issues when using the Secure Boot / Fast Boot options in combination with the dedicated Nvidia / AMD GPU.
Files contained in this archive:
GTX 660m - 80.07.39.00.0F.zip Dell
GTX 680m - 80.04.5B.00.02.zip Dell
7970m - 015.022.000.001.000000.C42904A1.119.zip Dell
Dell 675m - 70.24.4E.00.10.zip
To learn more about how to use the files in this archive, please visit the thread below:
Donation link
In case you want to buy me a beer
Thanks and cheers!

User with any of the M14x R2 / M17x R4 / M18x R2 notebooks with a current BIOS have reported issues when using the Secure Boot / Fast Boot options in combination with the dedicated Nvidia / AMD GPU.
Files contained in this archive:
GTX 660m - 80.07.39.00.0F.zip Dell
GTX 680m - 80.04.5B.00.02.zip Dell
7970m - 015.022.000.001.000000.C42904A1.119.zip Dell
Dell 675m - 70.24.4E.00.10.zip
To learn more about how to use the files in this archive, please visit the thread below:
Donation link
In case you want to buy me a beer
Thanks and cheers!

User with any of the M14x R2 / M17x R4 / M18x R2 notebooks with a current BIOS have reported issues when using the Secure Boot / Fast Boot options in combination with the dedicated Nvidia / AMD GPU.
Files contained in this archive:
GTX 660m - 80.07.39.00.0F.zip Dell
GTX 680m - 80.04.5B.00.02.zip Dell
7970m - 015.022.000.001.000000.C42904A1.119.zip Dell
Dell 675m - 70.24.4E.00.10.zip
To learn more about how to use the files in this archive, please visit the thread below:
Donation link
In case you want to buy me a beer
Thanks and cheers!

Alienware M17x R3 A12 unlocked BIOS with tweaks on SATA settings
Files contained in this archive:
AtpTimerInfo.dll
Ding.wav
FWUpdLcl.exe
InsydeFlashx64.exe
iscflashx64.dll
iscflashx64.sys
PAR00MEC.fd
platform.ini
READ ME.txt
xerces-c_2_7.dll
To learn more about how to use the files in this archive, please visit the thread below:
Donation link
In case you want to buy me a beer
Thanks and cheers!

This file is an unlocked version of A05 BIOS from Dell for the Alienware M11x R3
Files contained in this archive:
READ ME.txt
M11x R3 - A05 [unlocked].exe
To learn more about how to use the files in this archive, please visit the thread below:
Donation link
In case you want to buy me a beer
Thanks and cheers!

Files contained in this archive:
flash.bat
READ ME.txt
SVS_13-15_seriesFixer.exe
To learn more about how to use the files in this archive, please visit the thread below:
Donation link
In case you want to buy me a beer
Thanks and cheers!

Files contained in this archive:
Fptw64_(8_series).zip
Lenovo_Y510p-Y410p_[v1.07][v1.09][v1.10]_BiosFixer.zip
Lenovo_Y510p-Y410p_[v3.05]_modified.zip
Y510p-Y410p_[v2.04][v2.07]_BiosFixer_(Whitelist only).zip
Y510p-Y410p_v207_[stock].zip
For information on how to use the files in this archive, see here:
My donation link in case you want to buy me a beer